how do i make a ramp around a corner?
Make an auger, (see below) and scale to suit.

Delete the sections you don't want.

Extrude it's ends to provide entry/exit platforms.

Extrude all vertices down in the Z axis for thickness if necessary.

(the cylinder at center is optional)

Auger Blade -
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Add a Curve path, leave it a, straight line.

Add the "Screw" modifier.  The bezier will turn into a solid disc.

Increase the "Screw" slider to watch the  Auger forming up.

Increase the "steps" to improve the circumference curvature.

Use ATL-C in Object mode to convert it to mesh.